Granted Patent
Utility
US 5,809,952 · App. 08/773,571
Valve opening system of internal combustion engine
Inventors:
Takashi Ono, Fumio Akikawa, Akira Matsumoto, Masahiko Takeuchi
Patented Case
View Patent ↗
Granted: Sep 22, 1998
Filed: Dec 27, 1996
Inventors
Takashi Ono
Fumio Akikawa
Akira Matsumoto
Masahiko Takeuchi
Assignee (at issue)
MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.